might not want to go negative because they don't want to have gone negative upon. >> reporter: tied with romney for second in several polls, texas congressman ron paul was not invited to the pro-israel event because in part he wants to slash aid to the jewish state. in an interrue with fox, rick perry refused to criticize romney or gingrich on issues, instead ripping the business regard for romney or gingrich for years of government. >> if you are part of washington, still are, you are part of the problem. >> reporter: he made overt appeal to evangelical christians who have doubts about romney and gingrich. >> if evangelical in iowa is looking for somebody they know every day that the president's faith is going the guide them and the values, i ask people to you know, which one of those ten commandments do you not like? that is how i try to live my life. >> before the republican jewish conference this morning, gingrich met privately at a rosalyn, virginia, hotel with a group of influential old school d.c.